had every right to drop the Atomic bomb on Japan and therefore force them to surrender. The Japanese had at that time‚ already lost quite a lot of battles against the US and were forced to retreat back to Japan. Yet‚ the Japanese borders were heavily fortified. Had the Americans attacked Japan‚ they estimated their losses to be about 500 000 men. By dropping the atomic bomb‚ an estimated number of 100 000 people died. So in the end you can see that dropping the atomic bomb has saved quite a lot of
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of Pr and Nd)‚ another mixture in the form of erbia‚ and yttrium; unreliable information about atomic mass made correct positioning of these elements in the table difficult. Some had not yet been isolated as elements. There was no way of predicting how many of these elements there would be until Henry Moseley (1887–1915) analysed the X-ray spectra of elements and gave meaning to the concept of atomic number. He
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Fluorine Moissan discovered fluorine in 1886. It is a chemical element with the symbol F‚ atomic number 9‚ 9 electrons and protons‚ 10 neutrons‚ and the atomic mass of 19. Being the lightest halogen‚ it has one stable isotope‚ fluorine 19. At standard pressure and temperature‚ the element is a pale yellow gas as a liquid its a bright yellow. The electrons are located outside the nucleus of the atom. Electrons are organized in such a way that the space between them are inter dispersed. Within this
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This list contains the 118 elements of chemistry. The chemical elements of the periodic chart sorted by: | Electro- negativity | Name chemical element | Symbol | Atomic number | - Name alphabetically | 0.7 | Actinium | Ac | 89 | - Atomic number | 0.79 | Lanthanum | La | 57 | - Symbol | 0.82 | Potassium | K | 19 | - Atomic Mass | 0.82 | Strontium | Sr | 38 | - Electro negativity | 0.89 | Cerium | Ce | 58 | - Density | 0.89 | Thorium | Th | 90 | - Melting point | 0.93 | Sodium | Na
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so unstable that there is no point trying to synthesis new elements? This leads to the question: ‘How does the size of an element affect the stability?’ What are superheavy elements? The scientific term ‘superheavy’ means elements that have an atomic number that is heavier than‚ element 101‚ which is Rutherfordium. As they suffer from radioactive decay when exposed to lighter elements‚ they are not naturally occurring. Meaning‚ scientists can only artificially make them in laboratories. [1][3] Explanation-
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propreties. In all of the triads‚ the atomic mass of the second element was very close to the average of the atomic weights of the first and third elements. This was called the « Law of Triads ». Mendeleev The Russian chemist Dmitri Mendeleev was the first scientist that produced a periodic table based on atomic weights and arranged ‘periodically’. He succeeded in arranging all known elements into one table. Elements were arranged in a table ordered by atomic mass‚ corresponding to relative
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The Element Niobium Atomic Number: 41 Atomic Weight: 92.90638 Melting Point: 2750 K (2477°C or 4491°F) Boiling Point: 5017 K (4744°C or 8571°F) Density: 8.57 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 5 Group Number: 5 Group Name: none What’s in a name? Named for the Greek mythological figure Niobe. Say what? Niobium is pronounced as ni-OH-bee-um. History
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These enzymes in turn produce cellular energy and regulate nerve transmission‚ blood clotting‚ and oxygen transport. Name: Copper Symbol: Cu Atomic Number: 29 Atomic Mass: 63.546 amu Melting Point: 1083.0 °C (1356.15 K‚ 1981.4 °F) Boiling Point: 2567.0 °C (2840.15 K‚ 4652.6 °F) Number of Protons/Electrons: 29 Number of Neutrons: 35 Classification: Transition Metal Crystal Structure: Cubic Density @ 293 K: 8.96 g/cm3 Color: red/orange
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Einstein: Philosopher-Scientist. N.p.: Cambridge University Press‚ 1949. Print. 2. Amadeo‚ Kimberly. 2012 Presidential Debate Summary. N.p.‚ 2012. Web. 1 Mar. 2013. . 3. Feyerabend‚ Paul. "Discussions with Einstein on Epistemological Problems in Atomic Physics." N.p.‚ n.d. Web. 1 Mar. 2013. . 4. "Ways of Knowing." Ways of Knowing. N.p.‚ 2011. Web. 1 Mar. 2013. . 5.
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Periodic table March 24‚ 2013 Four trends that will be covered: Atomic size Ionization Energy Electronegativity Electron Affinity Each of these has a group trend and a period trend A group trend refers to what is happening with the atom as you travel up or down a column of the periodic table. A period trend refers to what is happening with the atom as you move left or right across a row of the periodic table Atomic Size When discussing an atom’s size‚ usually the size being referred
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